只有hello包实现多跳，还没加入业务数据

具体的还要看opencode和gpt记录接着优化

sim/main.py

@@ -26,6 +26,7 @@ def deploy_nodes(
     channel: Channel,
     num_nodes: int = None,
     area_size: float = None,
+    metrics_collector: MetricsCollector = None,
 ) -> list:
     """
     Deploy nodes randomly in the area.
@@ -35,6 +36,7 @@ def deploy_nodes(
         channel: Wireless channel
         num_nodes: Number of nodes (default from config)
         area_size: Area size (default from config)
+        metrics_collector: Metrics collector for observability
 
     Returns:
         List of Node objects
@@ -57,6 +59,7 @@ def deploy_nodes(
         y=sink_y,
         channel=channel,
         is_sink=True,
+        metrics_collector=metrics_collector,
     )
     nodes.append(sink)
 
@@ -65,7 +68,14 @@ def deploy_nodes(
         x = random.uniform(0, area_size)
         y = random.uniform(0, area_size)
 
-        node = Node(env=env, node_id=i, x=x, y=y, channel=channel)
+        node = Node(
+            env=env,
+            node_id=i,
+            x=x,
+            y=y,
+            channel=channel,
+            metrics_collector=metrics_collector,
+        )
         nodes.append(node)
 
     return nodes
@@ -118,7 +128,11 @@ def run_simulation(
     # Create channel
     channel = Channel(env)
 
-    # Deploy nodes
+    # Create metrics collector first (before deploying nodes)
+    metrics = MetricsCollector()
+    metrics.set_start_time(0.0)
+
+    # Deploy nodes with metrics collector
     if num_nodes is None:
         num_nodes = config.NODE_COUNT
     if area_size is None:
@@ -126,15 +140,11 @@ def run_simulation(
     if sim_time is None:
         sim_time = config.SIM_TIME
 
-    nodes = deploy_nodes(env, channel, num_nodes, area_size)
+    nodes = deploy_nodes(env, channel, num_nodes, area_size, metrics)
 
     # Setup receive callbacks
     setup_receive_callback(nodes, channel)
 
-    # Create metrics collector
-    metrics = MetricsCollector()
-    metrics.set_start_time(0.0)
-
     # Add collision callback
     initial_collisions = channel.collision_count